Generally, copper foil is a foil form of copper less than the thickness of 70µm and there are a rolled copper foil and an electrolytic copper foil. Normally, a rolled copper foil is made by rolling and annealing electrolytic copper continuously and there is a restriction of the length. In contrast, an electrolytic copper foil has no restriction of the length because it is manufactured under the process which is shown below. FURUKAWA ELECTRIC is contributing its energy to manufacturing electrolytic copper foils.
Especially, together with world's top share is obtained for lithium-ion batteries, they are used for flexible printed distributing boards, so their stable performance have been winning approval.

Manufacturing of electrolytic copper foil is started with the process of electrodepositing copper to a rolling drum and rolling it up. In this process, according to the condition of electrolysis, raw foils which have mechanical features suited to each purpose from general printed contributing boards to high functional digital equipment are manufactured. According to the purposes, raw materials of different mechanical features from 6 µm to 175 µm are manufactured.

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It is widely responsible to features required to various electronic devices such as one surface and both surfaces roughening processing, fine roughening processing and black processing foils. To clear various types of reliability tests which are required to each purpose, roughening processing and anticorrosive processing are done.

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It is processed to the width and the length according to the customer's specification.

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Processing to sheet products and guide bore processing for pin laminations are done. Going through inner process tests and reliability tests, etc, products which have passed the last evaluation are shipped as roll products or sheet products.